I want to have a form field with the current date as the default, but once
the form is protected, I want the user to be able to change the date if
necessary. How do I do this?

Also, I have a form field that performs a sum calculation. How do I get it
to update automatically if changes are made to the cells it is summing? I
know how to do this when the form is unprotected, but when it is protected
"update fields" or F9 doesn't work because I can't select the field.